apt-get install nftables orphan-sysvinit-scripts
cp /usr/share/orphan-sysvinit-scripts/nftables /etc/init.d
update-rc.d nftables defaults

cd devuan_gnome
cp nftables /usr/local/bin/
cd /usr/local/bin/
chmod 755 nftables
nft flush ruleset

nano /usr/local/bin/nftables

nftables
echo '#!/usr/sbin/nft -f' > /etc/nftables.conf
echo 'flush ruleset' >> /etc/nftables.conf
nft list ruleset >> /etc/nftables.conf
cat /etc/nftables.conf

reboot